Human Hearing Limits
I recently was curious at what the highest frequency I could hear. After noodling around online for a bit, I found some very interesting articles. One of which was a hearing test. I've posted an image of my results below.
The page itself is dated back to 2005, but the information is still and will always be relevant. Give it a quick read and try the test out. If your inclined, post your results.
When I took this test I used headphones, but I had 3 computers and a network switch with a fan running so I did have some background noise that was interfering.